科普图表：咖啡因代谢之旅

Scientific infographic poster explaining the metabolic pathway of caffeine inside the human body, front-view flat presentation. Layout: a centered cream-colored human silhouette in minimal flat style, with a clear five-stage horizontal flowchart arrow flowing left to right across the torso, from ingestion in the stomach, absorption into the bloodstream, liver processing through the CYP1A2 enzyme, blocking adenosine receptors in the brain, to final excretion through the kidneys. Each stage has a numbered circular badge, elapsed-time labels in hours (peak blood concentration 30-60 minutes, half-life 5-6 hours) and small flat icons for the coffee cup, stomach, liver, brain and kidneys. Color system: warm coffee browns (#5C3A21, #8B5A2B) on a cream background (#F5EFE6) with teal highlights (#2A9D8F) for data points and a deep espresso header (#3E2723). Typography: bold condensed sans-serif title, medium sub-labels, thin data captions with clear hierarchy. Background: subtle fine-dot grid texture with a soft parchment vignette. Data feel: rigorous laboratory poster with tick marks and a footnote bar. Lighting: soft diffused studio light from the upper left, gentle drop shadows under badges, matte paper finish. 4k